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A. LINDBERG AUTOMATIC IMPULSE CONNECTION FOR MAGNETO ELECTRIC IGNITERS Filed Nov. 24, 1933.

Patented June 6, 1933 UNITEDA STATES AlA'frislv'r OFFICE ANDERS LINDBERG, oF sToCxnoLM, `swEnnN AUTOMATIC IMrULsE CONNECTION nda nAGNETo-ELECTRIC IGNITEns Appneatien mea November 241, 1931, serielNe. 577,092, and 1n sweden Deeember 15,1930; u

In order to produce the first ignition at the starting of internal combustion engines with magneto-electric igniters it is necessary to impart to the magnet for a short moment 5 such a great speed that an electric spark may be` generated. For. facilitating this in an easy manner one has provided so-called impulse connections where the armature of the igniter is connected by a spring with a member rotated manually, for instance over the motor, a locking member releasableby a cam on the manually rotated member first f against the action of the spring preventing the armature from accompanying the manually rotated member, but after the releasing of the locking` member the armature is quickly rotated by the spring until it strikes against a stop and thereby is arrested in the initial position in relation to themanually rotated member.

However, it has been proved that the shock produced each time at the arresting to the armatureby the stop causes both the igniter and the impulse connection to get in disorder after having been in use for a relatively short time only. For this reason one has tried to avoid the said hard shock by letting the other end of the spring from the stop, but one has not succeeded in obtaining a reliable construction.

This invention has for its object a device which Works Without shocks and is quite re liable.

The invention is illustrated in the accompanying drawing Where Figure 1 is an axial section of an impulse connection according to the present invention and mounted on the shaft ofan igniter,

`Figure 2 is an end viewof the impulse connection, i

Figure 3 is a side view of the` same with the protecting cover removed, y

Figures 4, 5 and 6 are sections on the line A to B of Figure 3 at different periods of an 45 operation. y

In the drawing 1 is a shaft supporting a magnet for a magneto-electric igniter.` To the said shaft is fixed a stop-cap 2 carrying at its periphery preferably two swingable 50 pawls 3 adapted to engage a stationary stop` 4 on fthe inner side of a protecting `cover 5 enclosingthe stoplcap. The pawls 3 are providedwith `weights 6 keeping them out of engagement with the stationary stop when the speed of rotation of the shaft 1 exceeds 55 a certain value. A driving cap 7 is mounted on `the outside of the stop-cap 2 andis rotatable inrelation thereto, the said driving cap beingrotated manually by acrank or the` like (not shown). The drivingV cap 7 is :GQ connected with the stop-cap 2 by meansof a helical spring 8. Releasing lugs 9 are mounted on the driving cap, and when the i samchas been rotated for a certainiangle in n relation to the stop-cap the said releasing lugs act upon the pawls for disengaging them from the stationary stop, so thatthe stop-cap 2 may be rotated by the spring 8 after the driving cap. y l i According to the invention the ends of the spring 8 are not rigidly connected to the driving cap and the stop-cap respectively, but vthey are movable in relationt to the same. In the shown embodiment this is pro- I ducedin such a manner that the spring 8 7? which is wound round the driving cap penetrates `with its ends 11, 12 bent radially inwards, into peripheral slits 13, 14 on the two caps 3 and 7. f Y

The slits lie inconformity with each other and occupy angle-arcs of the same size. By the spring the caps are maintained axially in right `positions to one another.

The device in question operates in the fol lowing manner: When the device is in rest the somewhat bent spring 8 keeps the caps 2 and 7 in the position shown in Figure 4 with the slits 13, 14 kept in conformity with each other. 1f the driving cap 7 is rotated counter-clockwise the stop-cap also rotates q until one of the pawls 3 engages the station` ary stop 4. Then the driving cap 7 rotates relatively to the stopcap 2 against the action olf the spring 8, while the end 11 of the spring slides in the slit 13 of the stop-cap 2 and the slit 14 `of the driving cap 7 slides on the end 12 of the spring 8 (Figure 5)., When the said pawl 3 then releases the stopcap 2 by the action of the releasing lug 9 N the stopcap 2 is forced by the spring 8 into its initial position in relation to the driving cap 7 (Figure 4), but on account olf the inertia the stop-cap continues, against the action of the spring 8, for a distance past the said position7 whereby the stop-cap 2 brings with it the end ll of the spring 8 which slides in the slit 14 of the driving cap 7 while the slit 13 of the stop-cap 2 slides on the end 12 of the spring 8 (Figure 6). The stop-cap 2 swings quickly forward and backward until the caps occupy again the posil tion of Figure 4 in relation to each other withoutl such a shock being produced as in known impulse connections. It is evident that one may let the ends of the spring 8V enter into common slits of the two caps instead of letting thempenetrate each into one slit. In this case the spring may for instance consist of a broad leaf spring including only a portion of the periphery.

Instead of a single spring one may also provide two springs which are ixed with their one end to the driving cap and with their other end engage the slits in the manner described. It is also possible for instance to mount the spring between or within the two caps. The principal is that the ends are not rigidly fixed to the caps but that they are able to be slidden relatively to them.

I-Iaving now described by invention, what I claim as new and desire to secure by Letn ters Patent is:

1. In an automatic impulse connection for magneto-electric igniters, a driving cap, a stop-cap, each cap having a corresponding slit provided therein, at least one spring interconnecting said caps, the ends of the spring being slidable relative to the two caps, each of the two spring ends in its initial position resting against one end of the said slits.

2. Apparatus according to| claim l, in which the said slits have the shape of anglearcs of the same size.

In witness whereof I have hereunto signed my name.

ANDERS LINDBERG. 

